how to /etc/udev/rules.d

This is the way to add a new rule. For example, I'm going to add a new rule for a USB UART/RS485 device in order to avoid entering the sudo command:

Add the following file to /etc/udev/rules.d/89-ftdi-uart-rs485.rules:

# FTDI USB-RS485 Cable Permissions

# Rules written by Oscar Gomez Fuente ( oscargomezf@gmail.com )

# FTDI USB vendor ID = 0x0403

# FTDI USB product ID = 0x6001

ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", MODE="0660", GROUP="dialout", RUN+="echo USB-RS485 Cable CONNECTED!"

Edit the file /etc/gorup and add your username to the groups tty and dialout:

...

tty:x:5:oscargomez

...

dialout:x:20:oscargomez

Then reboot the system.

Reload rules after edit

# udevadm control --reload-rules